Automatic safety gas-valve



D. C. CARVEB..

Patented! July 6, 1926}.

2 SHEETS-SHEET 1- D. C. CARVERx AUTOMATIC SAFETY GAS'VALVE. APPLICATIONFILED FEB, 5. 1919.

1,346,000. Patented J uly 6, 1920.

2 SHEETS-SHET 2- Z O. dawn/e7" s'rATEs DON C. CARVER, OF CAMBRIDGE,OHIO.

AUTOMATIC SAFETY GAS-VALVE.

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Specification of Letters Patent.

Patented July 6, 1920.

Application filed February 5, 1919. Serial No. 275,162.

To alZ whom, it may concern:

Be it known that I, DON C. CARVER, a citizen of the United States ofAmerica, residing at Cambridge, in the county of Guernsey and State ofOhio, have invented new and useful Improvements in Automatic SafetyGas-Valves, of which the following is a specification. k

This invention relates to automatic safety gas valves the object in viewbeing to provide a small safety attachment for all natural andartificial gas fixtures, said attachment serving to prevent explosionscaused by the accidental turning on of gas or by the failure of the gaspressure resulting in the extinguishing of the flame and followed by theexplosion upon recurrent or return of normal pressure. The improveddevice is designed to fit the standard fixture now in universal usewhich may of course be made in other sizes.

lVith the above and other objects in view, the invention consists in thenovel construction, combination and arrangement herein fully described,illustrated and claimed.

in the accompanying drawing:

Figure 1 is a side elevation of the complete burner showing the capclosed.

Fig. 2 is a similar view with the cap open.

Fig. 3 is a similar view with cap partly open.

Fig. 4: is an enlarged vertical section of the same showing the capclosed.

Fig. 5 is a similar view showing the cap open.

Referring to the drawings, 1 designates a body of theiburncr which is ofthe usual formation and formed in the bottom thereof with an opening 2for the nozzle and also formcdat the top thereof with an outlet 3 forthe gaswhere it is ignited into a flame.

In carryingout the present invention. I employ a nozzle 4 loosely fittedupon the upper end of which is a slidable cap 5. The upper portion ofthe nozzle 4 within the body 1 is tapered or made frusto-conical asshown at 6 thereby forming a reduced upper end portion 7. Extendingaround the reduced portion 7 is a circumferential stop flange 8. thepurpose of which will presently appear. The reduced portion 7 of thenozzlc is formed in the extreme upper end thereof with gas ports 9separated from each oihcl' by means of intervening segments 10.

Each of the ports 9 is open at its upper extremity as shown.

The cap 5 which is slidable upon the re-' duced portion 7 of the nozzle4 is likewise provided with gas ports 11 and intervening segments 12,the ports 11 being adapted to reglster with the ports 9 of the nozzle 4.The segments 12 are provided at their lower extremities with inwardlyprojecting stop lips 13 which are adapted to engage the underside of theflange 8 to limit the upward ports 9 and 11 exactly register with eachother so as to insure the proper flow of gas when the cap is'in itsraised position.

Extending upwardly from the center of the cap 5 is a stem 15 having ashoulder or enlargement in the form of a knob 16 at the upper extremitythereof. The stem 15 works through an elongated eye or slot 17 in thedownwardly curved inner end of a rocker arm or lever 18 which ispivotally mounted at 19. The other or outer end of the rocker arm isbent downwardly to form a catch finger 20 and said finger is adapted toengage a notch-or shoulder 21 in an oscillatory cam 22 which ispivotally mounted at 23. The cam 22 is held at one limit of its movementby means of a contractile coiled spring 24 and is adapted to be actuatedin opposite direction by means of a spring retracted plunger 25 slidablethrough an opening 26 in the body 1 of the burner. The cain 22 is formedwith a shoulder 26' on one side against which the inner end of theplunger acts to impart oscillatory movement to the cam.

From the foregoing it will be observed that the rocker arm or lever 18,the coacting cam 22 and cooperating spring 24, form a spring pressedlever means for automati- I (rally holding and locking the cap in aclosed is as follows 2-- I Vhen the gas is turned on the nozzle 4,

the pressure of thegas raises the cap 5 until opened to allow the gas toescape into the body 1 of the burner. Should, for any reason, thepressure of the gas diminish or be cut off, the cap 5 descends bygravity to its closed position. As the cap descends, the knob orshoulder 16 engages the adjacent arm of the rocker or lever 18 and movessaid end of the arm downwardly with it. This allows the hook end 20 ofthe rocker arm to rise the same being lifted by the action of the cam 22under the influence of the cam actuating spring. The rocker -arm is thuslocked by the cam and in turn serves to hold the capdown tightly on thebody of the nozzle preventing any escape "of gas in case the pressureshould again rise. This renders the valve entirely safe-and preventsaccident. In order to operate thevalve again, it is necessary to pressinwardly on the plunger 25, thereby releasing the rocker arm andpermitting the cap to be raisedby the gas pressure in the nozzle.

I claim An automatic safety gas valve, comprising a nozzle having, gasports in the discharge endthereof, a cap slidably mounted upon saidnozzle and also formed with corresponding gas ports, and a springpressed lever means for automatically limiting the opening movement ofsaid cap, said cap bemg raised by the pressure of the gas receivedin thenozzle, said spring pressed lever means also serving to hold said cap ina closed position upon the fall in the pressure of the gas, and meansfor releasing said spring pressed lever means from a locked position. I

In testimony whereof I afiix my signature. DON C. CARVER.-

